Keywords: Maximal three-colorable.svg Diagram demonstrating two maximal three-colorings of different sizes which shows that three-colorings do not form a matroid The one on the left cannot be enlarged because the only remaining vertex is already adjacent to all three colors Created by Derrick Coetzee in Adobe Illustrator and Photoshop Maximal three-colorable png Inkscape 2015-09-01 Vectorisation BethNaught Original Dcoetzee Original Dcoetzee Vectorisation Graph coloring; vertex Media by User BethNaught |